Improvement in exhaust-nozzles



' 'a. SEW ELL.

I Exhaust-Nozzles. N-0.157,231. Patented Nov. 24,1874.

W-unauu mm am UNITED STATES PATENT OFFICE.

GEORGE s wELL, or BROOKLYN, NEW YORK.

IMPROVEMENT IN EXHAUST-NOZZLES.

Specification forming part of Letters Patent No. 157,231, dated November24, 1874; application filed November 7, 1874.

CASE B.

To all whom it may concern:

Be it known that l, GEORGE SEwELL, of Brooklyn, in the county of Kingsand State of New York, have invented certain new and useful Improvementsin Exhaust- Nozzles; and I do hereby declare that the followingis afull, clear, and exact description of the same, reference being had tothe accompanying drawing forming part of this specification.

My invention relates to certain improvements whereby the engineer of alocomotive is enabled to vary the dimensions of the exhaust-nozzle, andthus control the velocity of the exhaust steam in its escape into thesmokestack, and thereby regulate the draft and the steam-generatingcapacity of the boiler, and the back pressure on the steam-pistons.

The invention consists in the combination with the exhaust pipe, of adivided nozzle composed of two shutters pivoted at or near the middle oftheir depth, in a frame attached to the exhaust-pipe, and provided witha lever for opening and closing them, so that the dimensions of thenozzle may be varied, and the velocity of the exhaust steam regulatedaccordingly.

In the accompanying drawing, Figure 1 is a side View of my invention.big. 2 is a side view at right angles to Fig. 1. Fig. 3 is a top view.Fig. 4 is a vertical section.

The exhaust-pipe A is of any suitable construction, and to its end isattached a frame, 0, to which the working parts of the nozzle areattached. The adjustable nozzle consists of two shutters, B B, the inneredge of each of which is concave, and terminates in a semi circularedge, b, so that when the edges of the two shutters are in contact witheach other, a circular opening is formed between them, as shown in Fig.3. Each shutter is attached to a shaft, D, the ends of which have theirbearin gs in the side pieces of the frame 0, so that the shutters mayoscillate between said side pieces. At one end of each shaft is an arm,F, one end of which is rigidly attached to the shaft, and the other endextends toward the opposite end of the frame (J. The inner ends of thearms F meet about midway of the length of the frame 0, and are connectedto each other by means of a pin or stud, g, 011 one of the arms workingin a slot, h, in the other arm. One of the arms F is in the form of alever with the shaft'D for its fulcrum. The long arm 1 of this lever isconnected by suitable connecting devices with the cab, so as to be underthe control of the engineer. By the attachment of the shafts to theshutters midway of their width, instead of to their lower edges, boththe upper and lower edges of each shutter move in an arc of a circle,the lower edge working in a concave surface, i, in the frame so as tofit snugly, and prevent leakage at those parts.

When motion is applied to the long arm 1 of the lever, in the directionof the arrow in Fig. l, the shutters B are caused to turn on their axes,so as to move their lower edges toward each other, and their upper edgesfrom each other, thus changing the tapering form of the space betweenthe shutters, and increasing the dimensions of the opening between theupper edges. Thus the engineer is enabled, at pleasure, to vary thedimensions of the exhaust-nozzle, and thereby control the velocity ofthe exhaust steam, and regulate the draft and the steam-generatingcapacity, as before described.

One of these adjustable nozzles may be applied to each cylinder, or theexhaust-pipes from both cylinders may be joined in one pipe, and thenozzle applied to theend of such pipe.

That I claim as new, and desire to secure by Letters Patent, is

l. The adjustable shutters B attached to the shafts D, and having boththeir upper and their lower edges moving in arcs of circles,substantially as shown and described.

2. The combination of the lever 1, arms F F, shafts D D, shutters B B,frame 0, and exhaust-pipe A, substantially as shown and described.

GEORGE SEWELL.

Witnesses MIoHAEL RYAN, BENJAMIN W. HOFFMAN.

